django_slots

Allows multiline strings to be captured and passed to template tags.

Demo

1. Register a component

# app/templatetags/component_tags.py
from django_slots import Library, Component

register = Library()


@register.block_component
class Details(Component):
    pass

2. Create a template

{# app/templates/components/details.html #}
<details>
    <summary>{{ summary|default:slots.summary }}</summary>
    {{ slot }}
</details>

Usage:

{% load component_tags %}
{% load slot_tags %}

{% details summary="the summary" %}
      the default slot
{% /details %}

{% details %}
    {% slot summary %}the <b>summary</b>{% /slot %}
    the default slot
{% /details %}

Installation

pip install django-slots

INSTALLED_APPS = [
    # ...
    
    'django_slots',
]

Slots

Use {% slot name %}{% /slot %} to capture and name a slot. These slots will be available in the template in a dictionary called slots. eg {{ slots.name }}.

Any lines not surrounded by a slot tag will be available in the component template as {{ slot }}.

Template

The default the template path is components/<component_name>.html.

Use template_name attribute or get_template_name() method to override.

Change name

By default, the template tag name will be the Component class name converted to snake case. Use the name attribute to override.

eg:

from django_slots import Component, Library

register = Library()


@register.inline_component
class Button(Component):
    name = 'btn'

{% btn %}

Change name format

By default, inline tags are named "{name}/" and block tags are named "{name}", "/{name}". To change this format specify inline_tag_name and block_tag_names attributes.

eg:

from django_slots import Component, Library

register = Library()


class AppComponent(Component):
    inline_tag_name = "{name}end"
    block_tag_names = "{name}", "end{name}"    

    
@register.component
class Button(AppComponent):
    pass

{% buttonend %}

{% button %}{% endbutton %}

Inline only template tag

Use @register.inline_component to only allow {% inline/ %} use.

Block only template tag

Use @register.block_component to only allow {% block %}{% /block %} use.

Validate arguments

Implement def get_content_data(slots, **kwargs) to validate arguments.

eg:

from django_slots import Component, Library

register = Library()


@register.component
class Button(Component):
    STYLE = ["primary", "secondary"]
    def get_context_data(self, slots, *, style: str):
        if style not in self.STYLE:
            raise self.validation_error(f"style {style!r} not in {self.STYLE!r}")
        return super().get_context_data(slots, style=style)

Namespace components

Components can be namespaced which is useful for creating a third party app.

from django_slots import Library, Component

register = Library()


class NHSUKComponent(Component):
    namespace = 'nhsuk'


@register.component
class Button(NHSUKComponent):
    pass

{% nhsuk:button %}
  Save and continue
{% /nhsuk:button %}

See https://github.com/nwjlyons/nhsuk-components